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Old 08-26-2005, 08:14 AM
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Don Moyer Don Moyer is offline
 
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Your Mercruiser is a far cry from our little four cylinder flat head Atomic 4 sailboat engine, but when an engine coughs and sputters when accelerating, it's usually an indication of a lean fuel mixture or a timing issue. I'm suspicious that your symptoms might come and go somewhat randomly (perhaps more prevalent when the engine temperature was high), and as you replaced your plug leads you picked up the mistaken impression that changing the leads was correcting the problem.

If you have an adjustment for your high speed fuel system, I'd make it a bit richer, and I'd check the timing as well. You may be a bit on the advanced side.

Don Moyer
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